is Series Rating saves here?

Status
Not open for further replies.
T

Toros

Senior Member
Location
Tujunga, CA
Hi,
I am confused little or lot here,

installing 400A, 3ph-commertial service
series rating with 10 feet away mounted new sub panel that are same manuf. as the 400A service. which is "Siemens"

I am choosing series rating instead of fully-rating
hoping to save some money.

note that; local Utility fault report indicates 42000A avail. short cir. value

here is my design;
The main breaker in 400A service: "JD6-A" @ 65000AIC (,
The 200A-3p Breakers in 400A service: "QJ2H" @ 42000AIC'
The 20A-1P breakers in sub panels: "QPH" OR "BQH" @ 42000A

QUESTION IS,
Can i use the sub breakers (QJ2H , QPH, BQH) @ 10,000 AIC ????????

Tanx
 
Toros said:
Hi,
I am confused little or lot here,

installing 400A, 3ph-commertial service
series rating with 10 feet away mounted new sub panel that are same manuf. as the 400A service. which is "Siemens"

I am choosing series rating instead of fully-rating
hoping to save some money.

note that; local Utility fault report indicates 42000A avail. short cir. value

here is my design;
The main breaker in 400A service: "JD6-A" @ 65000AIC (,
The 200A-3p Breakers in 400A service: "QJ2H" @ 42000AIC'
The 20A-1P breakers in sub panels: "QPH" OR "BQH" @ 42000A

QUESTION IS,
Can i use the sub breakers (QJ2H , QPH, BQH) @ 10,000 AIC ????????

Tanx
Click to expand...
My first guess is as long as you stay with all same manufacturer - they are probably going to be series rated, but one shouldn't assume they are either. Also consider feeder size and length, as you will have a reduced actual available fault current at the load end of feeders that could be low enough regardless of series ratings.
 
Last edited:
Last time we installed a series-rated panel, (GE) we got with the panel an approximate 40 page booklet with a zillion breaker part numbers with which to preserve the series-rating to additional or replacement breakers.
 
fmtjfw said:
Last time we installed a series-rated panel, (GE) we got with the panel an approximate 40 page booklet with a zillion breaker part numbers with which to preserve the series-rating to additional or replacement breakers.
Click to expand...

Maybe they should have sent a list of breakers that were not rated for your application - may have been a shorter list:cool:
 
kwired said:
My first guess is as long as you stay with all same manufacturer - they are probably going to be series rated, but one shouldn't assume they are either. Also consider feeder size and length, as you will have a reduced actual available fault current at the load end of feeders that could be low enough regardless of series ratings.
Click to expand...
None of these answer to my question
 
The answer to your question is in the chart I provided in Post #3.
(If I were inspecting the job the chart gives me the answer I need but I'm not going to second guess your AHJ. A call to your Siemens distributor should clarify)
 
Toros said:
None of these answer to my question
Click to expand...

Toros said:
This is not an answer to my question
Click to expand...

If you wanted a serious and direct to the point answer you should have went directly to Siemens instead of a public input forum. My first reply was a little bit of what Gus mentioned in post 3 - "Keep in mind there are other contributing factors such as motor contribution so engineering input is often a prudent idea" We do not know all those details and I was just mentioning a few things that can be factors as far as engineering input goes.

The second response was just a little humor, sorry you didn't appreciate it.
 
Status
Not open for further replies.
Top